钢筋预制混凝土沉井在海塘防冲设计中的应用

Application of reinforced pre-cast concrete caisson in seawall erosion prevention design

曹娥江河口大闸建成后,江道的演变发生变化。平时关闸挡潮,阻挡外海泥沙入江,洪水期开闸放水,河床呈单向冲刷状态,使海塘堤脚出现抛石体失稳、冲毁等险情,严重影响河口平原居民人身安全。钢筋混凝土预制沉井+护坦的直接保护方案,具有永久性好、后期维护少等优点,值得在今后的海塘防冲设计中推广应用。

After the buiding of Cao＇e River Estuary sluice, fiver evolution is changed. The sluice is closed at ordinary times for preventing tide and blocking off sediment into river. Sluice is opened for releasing water during flood season, and the riverbed shows one-way erosion state, thereby making seawall toe incline to stone riprap instability, wash-out and other risks, which seriously affect personal safety of estuafine plain residents. Direct protection plan of reinforced concrete pre- cast caisson ＋ apron has the advantages of good permanence, less post maintenance, etc. It is worthy of popularization and application in seawall erosion prevention design in the future.